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/* ===================================================================== */
/*
  @ORIGINAL_AUTHOR: Elena Demikhovsky
*/

/* ===================================================================== */
/*! @file
 * Test PIN attach - detach for MT application
 */
#include <assert.h>
#include <stdio.h>
#include <dlfcn.h>
#include <signal.h>
#include <sys/types.h>
#include <linux/unistd.h>
#include <pthread.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <string>
#include <list>
#include <syscall.h>


using namespace std;


/* 
 * The total number of threads that should run in this process
 * The number may be changed in command line with -th_num
 */
unsigned int numOfSecondaryThreads = 4;

/*
 * Get thread Id
 */
pid_t GetTid()
{
     return syscall(__NR_gettid);
}

extern "C" int ThreadHoldByPin()
{
	return 0;
}

bool threadHoldByApplication = true;;

/*
 * An endless-loop function for secondary threads
 */

void * ThreadEndlessLoopFunc(void * arg)
{
	// thread should be inside this loop until
	// Pin and application free it
	// 1. App frees thread when Pin attach is completed
	// 2. Pin frees thread when Pin detach is completed 
    while (ThreadHoldByPin() || threadHoldByApplication) 
    {
		sched_yield();
    }
	
	fprintf(stderr, "Thread %d runs native\n", GetTid());

    return 0;
}

// Print pin invocation command line
void PrintArguments(char **inArgv)
{
    fprintf(stderr, "Going to run: ");
    for(unsigned int i=0; inArgv[i] != 0; ++i)
    {
        fprintf(stderr, "%s ", inArgv[i]);
    }
    fprintf(stderr, "\n");
}


/*
 * Expected command line: <this exe> [-th_num NUM] -pin $PIN -pinarg <pin args > -t tool <tool args>
 */

void ParseCommandLine(int argc, char *argv[], list < string>* pinArgs)
{
    string pinBinary;
    for (int i=1; i<argc; i++)
    {
        string arg = string(argv[i]);
        if (arg == "-th_num")
        {
            numOfSecondaryThreads = atoi(argv[++i]) - 1;
        }
        else if (arg == "-pin")
        {
            pinBinary = argv[++i];
        }
        else if (arg == "-pinarg")
        {
            for (int parg = ++i; parg < argc; parg++)
            {
                pinArgs->push_back(string(argv[parg]));
                ++i;
            }
        }
    }
    assert(!pinBinary.empty());
    pinArgs->push_front(pinBinary);
}

/* This function should be replaced by Pin tool */
extern "C" void DetachPin()
{
	fprintf(stderr, "This function shouldn't be called form application\n");
	assert(false);
	return;
}

/* This function should be replaced by Pin tool.
   The Pin-replaced ThreadsReady returns true when Pin is attached
   and each thread sent notification.
 */
extern "C" int ThreadsReady(int numOfThreads)
{
	return 0;
}

/* AttachAndInstrument()
 * a special routine that runs $PIN
 */
void AttachAndInstrument(list <string > * pinArgs)
{
    list <string >::iterator pinArgIt = pinArgs->begin();

    string pinBinary = *pinArgIt;
    pinArgIt++;

    pid_t parent_pid = getpid();
    
    pid_t child = fork();

    if (child) 
    {
        fprintf(stderr, "Pin injector pid %d\n", child);
        // inside parent
        return;  
    }
    else
    {
        // inside child

        char **inArgv = new char*[pinArgs->size()+10];

        unsigned int idx = 0;
        inArgv[idx++] = (char *)pinBinary.c_str(); 
        inArgv[idx++] = (char*)"-pid"; 
        inArgv[idx] = (char *)malloc(10);
        sprintf(inArgv[idx++], "%d", parent_pid);

        for (; pinArgIt != pinArgs->end(); pinArgIt++)
        {
            inArgv[idx++]= (char *)pinArgIt->c_str();
        }
        inArgv[idx] = 0;
        
        PrintArguments(inArgv);

        execvp(inArgv[0], inArgv);
        fprintf(stderr, "ERROR: execv %s failed\n", inArgv[0]);
        kill(parent_pid, 9);
        return; 
    }
}

	
int main(int argc, char *argv[])
{
   list <string> pinArgs;
   ParseCommandLine(argc, argv, &pinArgs);
    
    pthread_t *thHandle;
    thHandle = new pthread_t[numOfSecondaryThreads];

	threadHoldByApplication = true;
    // start all secondary threads
    for (unsigned int i = 0; i < numOfSecondaryThreads; i++)
    {
        pthread_create(&thHandle[i], 0, ThreadEndlessLoopFunc, (void *)i);
    }
	
	// Attach Pin
    AttachAndInstrument(&pinArgs);

	// Wait for full attach
	while (!ThreadsReady(numOfSecondaryThreads+1)) 
	{
		sched_yield();
	}
	
	// Application does not hold threads any more
	threadHoldByApplication = false;
	
	// After Pin detach all threads should exit
	printf("App is ready for Pin detach\n");
	DetachPin();
	
    for (unsigned int i = 0; i < numOfSecondaryThreads; i++)
    {
        pthread_join(thHandle[i], 0);
    }
	    
    return 0;
}

